import React from 'react'

function Memo_Cp(props) {
    //模拟组件渲染很慢
    const begin = Date.now()
    while (1) {
        if (Date.now() - begin > 3000) {
            break;
        }
    }
  return (
    <div>Memo_Cp {props.a }--{props.b}</div>
  )
}

export default Memo_Cp